FERNALD. — GENUS PECTIS. 75 



with 4 or 6 rows of glands (only 2 rows on the small leaves) ; margins 

 with 5 to 9 pairs of seta3 : peduncles very few and scattered, capillary, 1 

 or 2 cm. long, 1-3-bracteate, involucre 5 mm. long, about 10-flowered: 

 pappus of 2 or 3 setiform awns barely as long as the akene. — P. Ber- 

 landieri, DC. ? var. Palmeri, Gray, Proc. Am. Acad. xxi. 393. — Chi- 

 huahua, south of Batopilas (Palmer, 1885, no. 61). 



-f— -f— Awns slightly or not at all dilated at the base. 



P. Tiniaristata, DC. Stems compressed-angulate, smooth or rough- 

 ish below the nodes, very diffusely branched from below the middle, 1 to 

 3 dm. high : leaves mucronate, scabrous above, with 2 or 4 rows of 

 glands beneath, bearing 3 to 5 pairs of setae ; the cauline leaves about an 

 inch long, the others becoming reduced to small bracts : peduncles slender, 

 8 to 13 mm. long, 1-3-bracteate : involucre 4 or 5 mm. high, about 10- 

 flowered: pappus a shallow cupuliform crown and 1 or 2 (rarely 0) very 

 slender setiform awns, 2 mm. long : akenes equalling the pappus, ap- 

 pressed short-setose. — Prodr. v. 99 ; Gray, Proc. Am. Acad. xix. 46. — 

 Mexico^£?e DC. 1. c. ; Jalisco, plains of Guadalajara (Pringle, no. 1813, 

 in part); Colima, Mauzanillo (Xantus). Both plants which have been 

 examined have the stems distinctly angulate, not " terete " as in De Can- 

 dolle's characterization ; but otherwise they conform closely to his 

 description. 



^— -H- -i— Awns none, pappus merely a squamellose cup. 



P. dichotoma, Klatt. Erect or suberect, 8 to 15 mm. high, glabrous, 

 somewhat dichotomous-branching : leaves spatulate-linear, su])mucronate, 

 the largest about 2 cm. long, 2 mm. wide, with 2 or 4 rows of glands 

 beneath, and bearing 2 to 4 pairs of sette : peduncles capillary, li cm. 

 long, naked or with 1 or 2 bracts : involucre 3 or 4 mm. high, 8-10- 

 flowered : cupuliform pappus slightly longer than in P. tiniaristata: 

 akenes short-setose or glabrate. — Leopoldina, xx. 92 (reprint 5). P. 

 flipes, Sch. Bip. in herb., not Harv. & Gray. P. Jaliscana^ Hemsley, 

 Biol. Centr.-Am. Bot. 225, in part, not Hook. & Arn. P. uniaristata, 

 DC, var. holostemma, Gray, Proc. Am. Acad. xix. 46. — Mexico, at 

 Consoquitlo (Liebmann, no. 394). 



* * * * Branching mostly from the base, often very diffuse : leaves linear with 

 large scattered marginal glands : heads scattered or more or less clustered, 

 on elongated capillar}' peduncles : involucral bracts 5 to 8, obtuse or acutish. 

 -!— Involucre 5-bracteate : awns obviously dilated at the base. 



P. filipes, Harv. & Gray. Very slender (or the stem rarely becom- 

 ing stout), 1 to 5 dm. high ; the diffuse branches smooth and shining or 



